JP7481517B2 - Terminal device, base station device, and communication method - Google Patents

Description

The present invention relates to a terminal device, a base station device, and a communication method.

A radio access method and radio network for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") is being studied by the 3rd Generation Partnership Project (3GPP). In LTE, a base station device is also called an eNodeB (evolved NodeB), and a terminal device is also called a UE (User Equipment). LTE is a cellular communication system in which the areas covered by a base station device are arranged in multiple cells. A single base station device may manage multiple serving cells.

3GPP is currently studying the next-generation standard (NR: New Radio) to be proposed for IMT (International Mobile Telecommunication)-2020, a standard for next-generation mobile communication systems formulated by the International Telecommunication Union (ITU) (Non-Patent Document 1). NR is required to meet the requirements of three scenarios, eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication), within a single technology framework.

"New SID proposal: Study on New RadioAccess Technology", RP-160671, NTT docomo, 3GPPTSG RAN Meeting #71, Goteborg, Sweden, 7th - 10th March, 2016.

The present invention provides a terminal device that communicates efficiently, a communication method used in the terminal device, a base station device that communicates efficiently, and a communication method used in the base station device.

(1) A first aspect of the present invention is a terminal device that communicates with a base station device in a serving cell, comprising an RRC layer processing unit and a receiving unit, and the RRC layer processing unit receives a downlink BWP (BandWidth) given by first system information in the serving cell. Part), the downlink BWP is set to an active downlink BWP, the RRC layer processing unit further sets a control resource set in the serving cell based on an MIB, the receiver monitors a first PDCCH with a first DCI format and a second PDCCH with a second DCI format in the active downlink BWP, the receiver calculates a first bit size of a first resource allocation field for a PDSCH in the first DCI format based on a number of resource blocks specifying a frequency band for the active downlink BWP, and calculates a second bit size of a second resource allocation field for a PDSCH in the second DCI format based on a number of resource blocks specifying a frequency band for the control resource set, and the receiver monitors a PDCCH used for scheduling the first system information in the control resource set.

(2) A second aspect of the present invention is a base station device that communicates with a terminal device in a serving cell, comprising an RRC layer processing unit and a transmission unit, wherein the RRC layer processing unit is configured to: Part), the downlink BWP is set to an active downlink BWP, the RRC layer processing unit further sets a control resource set in the serving cell based on an MIB, the transmission unit transmits a first PDCCH with a first DCI format and transmits a second PDCCH with a second DCI format in the active downlink BWP, the transmission unit calculates a first bit size of a first resource allocation field for a PDSCH in the first DCI format based on the number of resource blocks that specify a frequency band for the active downlink BWP, and calculates a second bit size of a second resource allocation field for a PDSCH in the second DCI format based on the number of resource blocks that specify a frequency band for the control resource set, and the transmission unit transmits a PDCCH used for scheduling the first system information in the control resource set.

(3) A third aspect of the present invention is a communication method for a terminal device that communicates with a base station device in a serving cell, comprising: configuring a downlink BWP (BandWidth Part) provided by first system information in the serving cell, the downlink BWP being set as an active downlink BWP; configuring a control resource set provided based on an MIB in the serving cell; monitoring a first PDCCH with a first DCI format in the active downlink BWP and monitoring a second PDCCH with a second DCI format; calculating a first bit size of a first resource allocation field for a PDSCH in the first DCI format based on the number of resource blocks that specify a frequency band for the active downlink BWP; calculating a second bit size of a second resource allocation field for a PDSCH in the second DCI format based on the number of resource blocks that specify a frequency band for the control resource set; and monitoring a PDCCH used for scheduling the first system information in the control resource set.

(4) A fourth aspect of the present invention is a communication method of a base station device that communicates with a terminal device in a serving cell, comprising: configuring a downlink BWP (BandWidth Part) given by first system information in the serving cell; setting the downlink BWP as an active downlink BWP; configuring a control resource set given based on an MIB in the serving cell; transmitting a first PDCCH with a first DCI format and a second PDCCH with a second DCI format in the active downlink BWP; calculating a first bit size of a first resource allocation field for a PDSCH in the first DCI format based on the number of resource blocks that specify a frequency band for the active downlink BWP; calculating a second bit size of a second resource allocation field for a PDSCH in the second DCI format based on the number of resource blocks that specify a frequency band for the control resource set; and transmitting a PDCCH used for scheduling the first system information in the control resource set.

According to this invention, the terminal device can communicate efficiently. Also, the base station device can communicate efficiently.

1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. 1 is an example showing a relationship between N ^slot _symb , a subcarrier interval setting μ, a slot setting, and a CP setting according to an aspect of the present embodiment. FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. FIG. 13 is a diagram illustrating an example of a method for determining the size of a resource allocation information field according to an aspect of the present embodiment. A diagram showing an example of a CBP indication information field according to one aspect of this embodiment. A diagram showing an example of mapping of SS blocks in one aspect of this embodiment. A figure showing an example of carrier band part adaptation according to one aspect of this embodiment. FIG. 11 is a diagram illustrating an example of the operation of a timer according to an embodiment of the present invention. FIG. 11 is a diagram illustrating an example of a resource block allocation method according to an aspect of this embodiment. 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. 1 is a schematic block diagram showing a configuration of a base station device 3 according to one aspect of the present embodiment.

The following describes an embodiment of the present invention.

FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of this embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3. Hereinafter, terminal devices 1A to 1C are also referred to as terminal device 1.

The frame structure is explained below.

In a wireless communication system according to one aspect of the present embodiment, at least OFDM (Orthogonal Frequency Division Multiplex) is used. An OFDM symbol, which is a time domain unit of OFDM, includes at least one or more subcarriers and is converted into a time-continuous signal in baseband signal generation.

The subcarrier spacing (SCS) may be given by the subcarrier spacing Δf=2 ^μ ·15 kHz. For example, μ may be any value between 0 and 5. Carrier bandwidth part (CBP)
For the above-mentioned embodiment (part 1), the μ used to set the subcarrier spacing may be given by a higher layer parameter (subcarrier spacing setting μ).

In the wireless communication system according to one aspect of the present embodiment, a time unit _Ts is used to express a length in the time domain. The time unit _Ts is given by _Ts = 1/(Δf _max · N _f ). Δf _max may be the maximum value of the subcarrier spacing supported in the wireless communication system according to one aspect of the present embodiment. Δf _max may be Δf _max = 480 kHz. The time unit _Ts is also referred to as _Ts . The constant κ is κ = Δf _max · N _f / (Δf _ref N _f,ref ) = 64. _{Δf ref} is 15 kHz and N _f,ref is 2048.

The constant κ may be a value indicating the relationship between the reference subcarrier spacing and _Ts . The constant κ may be used for the length of the subframe. The number of slots included in the subframe may be given based at least on the constant κ. Δf _ref is the reference subcarrier spacing, and N _f,ref is a value corresponding to the reference subcarrier spacing.

Downlink transmission and/or uplink transmission is composed of a frame having a length of 10 ms. The frame is composed of 10 subframes. The length of the subframe is 1 ms. The length of the frame may be a value independent of the subcarrier spacing Δf. That is, the frame setting may be given without being based on μ. The length of the subframe may be a value independent of the subcarrier spacing Δf. That is, the subframe setting may be given without being based on μ.

For the subcarrier spacing configuration μ, the number and index of slots included in a subframe may be given. For example, the first slot number n ^μ _s may be given in the range from 0 to N ^{subframe, μ} _slot in ascending order in the subframe. For the subcarrier spacing configuration μ, the number and index of slots included in a frame may be given. For example, the second slot number n ^μ _s,f may be given in the range from 0 to N ^{frame, μ} _slot in ascending order in the frame. N ^slot _symb consecutive OFDM symbols may be included in one slot. N ^slot _symb is the slot configuration.
The slot setting may be given based on at least a part or all of a cyclic prefix (CP) setting. The slot setting may be given by a higher layer parameter slot_configuration. The CP setting may be given based on at least a higher layer parameter.

Fig. 2 is an example showing the relationship between N ^slot _symb , subcarrier interval setting μ, slot setting, and CP setting according to one aspect of the present embodiment. In Fig. 2A, when the slot setting is 0 and the CP setting is normal CP (normal cyclic prefix), N ^slot _symb = 14, N ^{frame, μ} _slot = 40, and N ^{subframe, μ} _slot = 4. Also, in Fig. 2B, when the slot setting is 0 and the CP setting is extended CP (extended cyclic prefix), N ^slot _symb = 12, N ^{frame, μ} _slot = 40, and N ^{subframe, μ} _slot = 4. N ^slot _symb in slot setting 0 may correspond to twice N ^slot _symb in slot setting 1.

The physical resources are explained below.

An antenna port is defined by the fact that the channel on which a symbol is transmitted at one antenna port can be estimated from the channel on which the other symbol is transmitted at the same antenna port. If the large scale property of the channel on which a symbol is transmitted at one antenna port can be estimated from the channel on which a symbol is transmitted at the other antenna port, the two antenna ports are said to be Quasi Co-Location (QCL). The large scale property may be a long-range property of the channel. The large scale property may include at least some or all of the delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. The first antenna port and the second antenna port being QCL with respect to the beam parameters may mean that the receiving beam assumed by the receiving side for the first antenna port and the receiving beam assumed by the receiving side for the second antenna port are the same. The first antenna port and the second antenna port being QCL with respect to the beam parameters may mean that the transmitting beam assumed by the receiving side for the first antenna port and the transmitting beam assumed by the receiving side for the second antenna port are the same. The terminal device 1 may assume that the two antenna ports are QCL if the large-scale characteristics of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. The two antenna ports being QCL may mean that the two antenna ports are assumed to be QCL.

For each subcarrier spacing configuration and set of carriers, a resource grid of ^NμRB _,x ^NRBsc _subcarriers and N ^(μ) _symb ^{Nsubframe,μsymb} _OFDM symbols is provided. ^NμRB _,x may denote the number of resource blocks provided for the subcarrier spacing configuration μ for carrier x. Carrier x may denote either a downlink carrier or an uplink carrier. That is, _x may be "DL" or "UL". ^NμRB is a collective term for ^NμRB _,DL and ^NμRB _,UL . _NRBsc may denote the number of subcarriers contained in one resource block. One resource grid may be provided per antenna port p and/or per subcarrier spacing configuration μ ^and /or per transmission direction configuration. The transmission direction includes at least a downlink (DL: DownLink) and an uplink (UL: UpLink). Hereinafter, a set of parameters including at least an antenna port p, a subcarrier spacing setting μ, and a part or all of the transmission direction setting is also referred to as a first radio parameter set. That is, one resource grid may be provided for each first radio parameter set.

In the downlink, the carrier corresponding to the serving cell is called the downlink carrier (or downlink component carrier). In the uplink, the carrier corresponding to the serving cell is called the uplink carrier (uplink component carrier). Downlink component carriers and uplink component carriers are collectively called component carriers.

Each element in the resource grid provided for each first radio parameter set is called a resource element. The resource element is identified by a frequency domain index k and a time domain index l. A resource element identified by a frequency domain index k and a time domain index l is also called a resource element (k, l). The frequency domain index k indicates any value from 0 to N ^μ _RB N ^RB _sc −1. N ^μ _RB may be the number of resource blocks provided for the subcarrier spacing setting μ. N ^RB _sc is the number of subcarriers included in a resource block, and N ^RB _sc =12. The frequency domain index k may correspond to a subcarrier index. The time domain index l may correspond to an OFDM symbol index.

FIG. 3 is a schematic diagram showing an example of a resource grid in a subframe according to an aspect of the present embodiment. In the resource grid of FIG. 3, the horizontal axis is a time domain index l, and the vertical axis is a frequency domain index k. In one subframe, the frequency domain of the resource grid may include N ^μ _RB N ^RB _sc subcarriers, and the time domain of the resource grid may include 14·2 ^μ OFDM symbols. A resource block includes N ^RB _sc subcarriers. The time domain of the resource block may correspond to one OFDM symbol. The time domain of the resource block may correspond to one or more slots. The time domain of the resource block may correspond to one subframe.

The terminal device 1 may be instructed to transmit and receive using only a subset of the resource grid. The subset of the resource grid is also called a carrier band part, and the carrier band part may be given by a parameter of a higher layer and/or DCI. The carrier band part is also called a band part (BP: bandwidth part). That is, the terminal device may not be instructed to transmit and receive using all sets of the resource grid. That is, the terminal device may be instructed to transmit and receive using some resources in the resource grid. One carrier band part may be composed of multiple resource blocks in the frequency domain. One carrier band part may be composed of multiple consecutive resource blocks in the frequency domain. The carrier band part is also called a BWP (BandWidth Part). The carrier band part set for the downlink carrier is also called a downlink carrier band part. The carrier band part set for the uplink carrier is also called an uplink carrier band part.

A set of downlink carrier band parts may be configured for each serving cell. The set of downlink carrier band parts may include one or more downlink carrier band parts. A set of uplink carrier band parts may be configured for each serving cell. The set of uplink carrier band parts may include one or more uplink carrier band parts.

The higher layer parameters are parameters included in the higher layer signal. The higher layer signal may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the higher layer signal may be an RRC layer signal or a MAC layer signal.

The higher layer signal may be common RRC signaling. The common RRC signaling has at least some or all of the following features C1 to C3.
Feature C1) Mapped to the BCCH logical channel or the CCCH logical channel Feature C2) Includes at least the radioResourceConfigCommon information element Feature C3) Mapped to the PBCH

The radioResourceConfigCommon information element may include information indicating a configuration commonly used in the serving cells. The configuration commonly used in the serving cells may include at least a PRACH configuration. The PRACH configuration may at least indicate a set of one or more random access preamble indexes. The PRACH configuration may at least indicate a time/frequency resource of the PRACH.

The higher layer signaling may be dedicated RRC signaling, which comprises at least some or all of the following features D1 to D2:
Feature D1) Mapped to DCCH logical channel Feature D2) Includes at least radioResourceConfigDedicated information element

The radioResourceConfigDedicated information element may include at least information indicating a setting specific to the terminal device 1. The radioResourceConfigDedicated information element may include at least information indicating a setting of the carrier band part 512 and/or the carrier band part 513. The setting of the carrier band part 512 may at least indicate the frequency resource of the carrier band part 512. The setting of the carrier band part 513 may at least indicate the frequency resource of the carrier band part 513.

For example, the MIB, the first system information, and the second system information may be included in the common RRC signaling. Also, an upper layer message that is mapped to the DCCH logical channel and includes at least radioResourceConfigCommon may be included in the common RRC signaling. Also, an upper layer message that is mapped to the DCCH logical channel and does not include radioResourceConfigCommon may be included in the dedicated RRC signaling. Also, an upper layer message that is mapped to the DCCH logical channel and includes at least radioResourceConfigDedicated may be included in the dedicated RRC signaling.

The first system information may include at least a time index of a synchronization signal (SS) block (SS/PBCH block). The first system information may include at least information related to a PRACH resource. The first system information may include at least information related to setting up an initial connection. The second system information may be system information other than the first system information.

The radioResourceConfigDedicated information element may include at least information related to PRACH resources. The radioResourceConfigDedicated information element may include at least information related to setting up an initial connection.

The following describes the physical channels and physical signals related to various aspects of this embodiment.

An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in the uplink. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical channels are used:
PUCCH (Physical Uplink Control CHannel)
・PUSCH (Physical Uplink Shared CHannel)
PRACH (Physical Random Access CHannel)

The PUCCH may be used to transmit uplink control information (UCI). The uplink control information includes some or all of the channel state information (CSI: Channel State Information) of the downlink physical channel, a scheduling request (SR: Scheduling Request), and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (TB: Transport block, MAC PDU: Medium Access Control Protocol Data Unit, DL-SCH: Downlink-Shared Channel, PDSCH: Physical Downlink Shared Channel). HARQ-ACK may indicate an ACK (acknowledgement) or a NACK (negative-acknowledgement) corresponding to downlink data.

HARQ-ACK may indicate an ACK or NACK corresponding to one or more Code Block Groups (CBGs) included in the downlink data. HARQ-ACK is also referred to as HARQ feedback, HARQ information, HARQ control information, and ACK/NACK.

The scheduling request may be used at least to request PUSCH (UL-SCH: Uplink-Shared Channel) resources for the initial transmission.

The channel state information (CSI) includes at least a channel quality indicator (CQI) and a rank indicator (RI). The channel quality indicator may include a precoder matrix indicator (PMI). The CQI is an indicator related to the channel quality (propagation strength), and the PMI is an indicator indicating the precoder. The RI is an indicator indicating the transmission rank (or the number of transmission layers).

PUSCH is used to transmit uplink data (TB, MAC PDU, UL-SCH, PUSCH). PUSCH may be used to transmit HARQ-ACK and/or channel state information together with uplink data. PUSCH may also be used to transmit only channel state information, or only HARQ-ACK and channel state information. PUSCH is used to transmit random access message 3.

The PRACH is used to transmit a random access preamble (random access message 1). The PRACH is used for initial connection establishment procedures, handover procedures, connection re-establishment procedures, synchronization (timing adjustment) for uplink data transmission, and to indicate a request for PUSCH (UL-SCH) resources. The random access preamble may be used to notify the base station device 3 of an index (random access preamble index) provided by a higher layer of the terminal device 1.

The random access preamble may be provided by cyclically shifting a Zadoff-Chu sequence corresponding to a physical root sequence index u. The Zadoff-Chu sequence may be generated based on the physical root sequence index u. A plurality of random access preambles may be defined in one serving cell. The random access preamble may be identified based at least on an index of the random access preamble. Different random access preambles corresponding to different indices of the random access preamble may correspond to different combinations of the physical root sequence index u and the cyclic shift. The physical root sequence index u and the cyclic shift may be provided based at least on information included in the system information. The physical root sequence index u may be an index that identifies a sequence included in the random access preamble. The random access preamble may be identified based at least on the physical root sequence index u.

In Fig. 1, the following uplink physical signals are used in uplink wireless communication: The uplink physical signals may not be used to transmit information output from higher layers, but are used by the physical layer.
UL DMRS (UpLink Demodulation Reference Signal)
・SRS (Sounding Reference Signal)
UL PTRS (UpLink Phase Tracking Reference
Signal)

The UL DMRS is related to the transmission of the PUSCH and/or the PUCCH.
The DMRS is multiplexed with the PUSCH or PUCCH. The base station device 3 may use the UL DMRS to perform propagation path correction of the PUSCH or PUCCH. Hereinafter, transmitting the PUSCH and the UL DMRS related to the PUSCH together is simply referred to as transmitting the PUSCH. Hereinafter, transmitting the PUCCH and the UL DMRS related to the PUCCH together is simply referred to as transmitting the PUCCH. The UL DMRS related to the PUSCH is also referred to as the UL DMRS for the PUSCH. The UL DMRS related to the PUCCH is also referred to as the UL DMRS for the PUCCH.

The SRS may not be related to the transmission of the PUSCH or PUCCH. The base station device 3 may use the SRS to measure the channel state. The SRS may be transmitted at the end of a subframe in an uplink slot or a predetermined number of OFDM symbols from the end.

The UL PTRS may be a reference signal used at least for phase tracking. The UL PTRS may be associated with a UL DMRS group that includes at least an antenna port used for one or more UL DMRSs. The association of the UL PTRS with the UL DMRS group may be such that the antenna port of the UL PTRS and some or all of the antenna ports included in the UL DMRS group are at least QCL. The UL DMRS group may be identified based at least on the antenna port with the smallest index in the UL DMRS included in the UL DMRS group.

1, the following downlink physical channels are used in downlink wireless communication from the base station device 3 to the terminal device 1. The downlink physical channels are used by the physical layer to transmit information output from a higher layer.
・PBCH (Physical Broadcast Channel)
・PDCCH (Physical Downlink Control Channel)
PDSCH (Physical Downlink Shared Channel)

The PBCH is used to transmit a Master Information Block (MIB, BCH, Broadcast Channel). The PBCH may be transmitted based on a predetermined transmission interval. For example, the PBCH may be transmitted at an interval of 80 ms. The contents of the information contained in the PBCH may be updated every 80 ms. The PBCH may be composed of 288 subcarriers. The PBCH may be composed of 2, 3, or 4 OFDM symbols. The MIB may include information related to an identifier (index) of the synchronization signal. The MIB may include information indicating at least a portion of the slot number, subframe number, and radio frame number in which the PBCH is transmitted.

The PDCCH is used to transmit downlink control information (DCI). The downlink control information is also called a DCI format. The downlink control information may include at least one of a downlink grant or an uplink grant. The DCI format used for scheduling the PDSCH may be called a downlink grant. The DCI format used for scheduling the PUSCH may be called an uplink grant. The downlink grant is also called a downlink assignment or a downlink allocation.

The DCI format may include at least a part or all of a TBS information field mapped to information bits indicating at least the size of the transport block (TBS: Transport Block Size) transmitted on the PDSCH, a resource allocation information field mapped to information bits indicating at least the set of resource blocks to which the PDSCH is mapped in the frequency domain, an MCS information field mapped to information bits indicating at least the modulation scheme for the PDSCH, an HARQ process number information field mapped to information bits indicating at least the HARQ process number corresponding to the transport block, an NDI indication information field mapped to information bits indicating at least the NDI (New Data Indicator) corresponding to the transport block, and an RV information field mapped to information bits indicating at least the RV (Redundancy Version) for the transport block.

One or more information fields included in the DCI format may be mapped to information bits provided by joint coding of multiple pieces of indication information. For example, the DCI format may include an MCS information field that is mapped to information bits provided based on at least joint coding of information related to the TBS and information indicating the modulation scheme of the PDSCH.

The DCI format may be either a first DCI format or a second DCI format. Some or all of the fields included in the first DCI format may be provided at least based on dedicated RRC signaling. The set of information fields included in the second DCI format may be provided regardless of dedicated RRC signaling. The set of information fields included in the second DCI format may be provided based on common RRC signaling.

The size of the resource allocation information field included in the first DCI format may be based at least on dedicated RRC signaling. The size of the resource allocation information field included in the second DCI format may be based on common RRC signaling. The size of the resource allocation information field included in the second DCI format may be based on common RRC signaling.

The size of the resource allocation information field may be based at least on the number of resource blocks contained in the carrier band part in the frequency domain.

FIG. 4 is a diagram showing an example of a method for determining the size of a resource allocation information field according to one aspect of the present embodiment. In FIG. 4, the number of resource blocks _{NRB_CBP} included in the carrier band part in the frequency domain is set to 27. In pattern A of FIG. 4, the size _NRBG of the RBG is set to 4, and in pattern B of FIG. 4, the size _NRBG of the RBG is set to 2. In pattern A of FIG. 4, the number _{NRBG_CBP} of RBG (Resource Block Group) in the carrier band part is 7. In pattern B of FIG. 4, the number _{NRBG_CBP} of RBG in the carrier band part is 14. The number _{NRBG_CBP} of RBG in the carrier band part is given based at least on the number _{NRB_CBP} of resource blocks included in the carrier band part in the frequency domain and the size _NRBG of the RBG. The number of RBGs in the carrier band part _{NRBG_CBP} may be given by _{NRBG_CBP} = ceil ( _{NRB_CBP} / _NRBG ). Here, ceil ( _Xvalue ) may be a ceiling function for _Xvalue . ceil ( _Xvalue ) may be the smallest integer not less than _Xvalue . The number of RBGs in the carrier band part _{NRBG_CBP} may be given by _{NRBG_CBP} = floor ( _{NRB_CBP} / _NRBG ). Here, floor ( _Xvalue ) may be a floor function for _Xvalue . floor ( _Xvalue ) may be the largest integer not greater than _Xvalue .

In various aspects of this embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

In the first resource allocation method, the size of the resource allocation information field may be the same as the number of RBGs (Resource Block Groups). The first resource allocation method is a method in which a set of resource blocks to which the PDSCH is mapped is indicated by a bitmap of the RBGs.

In the second resource allocation method, the size of the resource allocation information field may be given by ceil(log ₂ (N _{RB_CBP} ×(N _{RB_CBP} −1)/2)). In the second resource allocation method, the size of the resource allocation information field may be given by ceil(log ₂ (N _{RBG_CBP} ×(N _{RBG_CBP} −1)/2)). The second resource allocation method may be a method of indicating consecutive resource block indexes as a set of resource blocks to which the PDSCH is mapped. The second resource allocation method may be a method of indicating resource blocks corresponding to resource block indexes between two selected resource block indexes among resource blocks included in the carrier band part as a set of resource blocks to which the PDSCH is mapped. The second resource allocation method may be a method of indicating consecutive RBG indexes as a set of resource blocks to which the PDSCH is mapped. The second resource allocation method may be a method of indicating, among the RBGs included in the carrier band part, an RBG corresponding to an RBG index between two selected RBG indexes as a set of resource blocks to which the PDSCH is mapped.

One downlink grant is used at least for scheduling one PDSCH in one serving cell. The downlink grant is used at least for scheduling the PDSCH in the same slot in which the downlink grant is transmitted.

One uplink grant is used for scheduling at least one PUSCH in one serving cell.

A physical channel may be mapped to one serving cell. A physical channel may not be mapped to multiple serving cells.

The first DCI format may include a CBP indication information field. The CBP indication information field may at least indicate a carrier band part to be set to the active carrier bandwidth part. The active carrier band part for a downlink carrier is also referred to as a downlink active carrier bandwidth part. The active carrier band part for an uplink carrier is also referred to as an uplink active carrier bandwidth part.
The terminal device 1 can receive at least the PDCCH and the PDSCH in the downlink active carrier band part. The terminal device 1 can receive at least the PUCCH and the PUSCH in the uplink active carrier band part. In addition, the terminal device 1 may not receive the PDCCH and the PDSCH in the carrier band part other than the downlink active carrier band part. In addition, the terminal device 1 may not transmit the PUCCH and the PUSCH in the carrier band part other than the uplink active carrier band part.

The first DCI format used for scheduling the PDSCH is also referred to as the first downlink DCI format. The first DCI format used for scheduling the PUSCH is also referred to as the first uplink DCI format. The first downlink DCI format and the first uplink DCI format are also referred to as the first DCI format.

Figure 5 is a diagram showing an example of a CBP indication information field according to one aspect of the present embodiment. In Figure 5, the size of the CBP indication information field is 2 bits. As shown in Figure 5, a carrier band part may correspond to each of the code points of the information bits to which the CBP indication information field is mapped. The size of the CBG indication information field may be 1 bit, 3 bits, or any other number of bits.

There may be one downlink active carrier band part for a given downlink carrier. There may be one uplink active carrier band part for a given uplink carrier.

There may be multiple downlink active carrier band parts for a given downlink carrier. There may be multiple uplink active carrier band parts for a given uplink carrier.

In the FDD (Frequency Division Duplex) mode, the downlink active carrier band part and the uplink active carrier band part may not correspond to each other. In the TDD (Time Division Duplex) mode, the downlink active carrier band part and the uplink active carrier band part may correspond to each other. The correspondence between the downlink active carrier band part and the uplink active carrier band part may be that the center frequency of the downlink active carrier band part and the center frequency of the uplink active carrier band part match. The correspondence between the downlink active carrier band part and the uplink active carrier band part may be that the carrier frequency (e.g., the minimum carrier frequency and the maximum carrier frequency) that can be set for the downlink active carrier band part and the carrier frequency (e.g., the minimum carrier frequency and the maximum carrier frequency) that can be set for the uplink active carrier band part match. The correspondence between the downlink active carrier band part and the uplink active carrier band part may be that a resource offset value N _{offset_CBP} associated with the downlink active carrier band part and a resource offset value N _{offset_CBP} associated with the uplink active carrier band part match. The correspondence between the downlink active carrier band part and the uplink active carrier band part may be that a range of resource block indexes available for the downlink active carrier band part and a range of resource block indexes available for the uplink active carrier band part match. When the downlink active carrier band part and the uplink active carrier band part correspond to each other, the CBP indication information field may indicate both the configuration of the downlink active carrier band part and the configuration of the uplink active carrier band part.

The CBP indication information field may at least indicate a downlink carrier band part set in the downlink active carrier band part. The PDSCH scheduled by the DCI format including the CBP indication information field may be received in the downlink carrier band part. The CBP indication information field may at least indicate a downlink carrier band part that receives the PDSCH scheduled by the DCI format including the CBP indication information field. The CBP indication information field may include at least information indicating an uplink carrier band part that transmits the PUSCH scheduled by the DCI format including the CBP indication information field.

The second DCI format may not include a CBP indication information field.

The second DCI format used for scheduling the PDSCH is also referred to as the second downlink DCI format. The second DCI format used for scheduling the PUSCH is also referred to as the second uplink DCI format. The second downlink DCI format and the second uplink DCI format are also referred to as the second DCI format.

In order to search for the PDCCH, one or more control resource sets (CORESET: CONtrol REsource SET) are configured in the terminal device 1. The terminal device 1 attempts to receive the PDCCH in one or more control resource sets.

The control resource set may indicate a time-frequency region to which one or more PDCCHs may be mapped. The control resource set may be a region in which the terminal device 1 attempts to receive the PDCCH. The control resource set may be composed of contiguous resources (localized resources). The control resource set may be composed of non-contiguous resources (distributed resources).

In the frequency domain, the unit of mapping of the control resource set may be a resource block. For example, in the frequency domain, the unit of mapping of the control resource set may be six resource blocks. In the time domain, the unit of mapping of the control resource set may be an OFDM symbol. For example, in the time domain, the unit of mapping of the control resource set may be one OFDM symbol.

The frequency domain of the control resource set may be the same as the system bandwidth of the serving cell. The frequency domain of the control resource set may also be given based at least on the system bandwidth of the serving cell. The frequency domain of the control resource set may also be given based at least on higher layer signals and/or downlink control information.

The time domain of the control resource set may be given based at least on higher layer signaling and/or downlink control information.

A control resource set may be a common control resource set. The common control resource set may be a control resource set that is set in common for multiple terminal devices 1. The common control resource set may be given based on at least a part or all of the MIB, the first system information, the second system information, the common RRC signaling, and the cell ID. For example, the time resource and/or the frequency resource of the control resource set that is set to monitor the PDCCH used for scheduling the first system information may be given based on at least the MIB.

A control resource set may be a dedicated control resource set. The dedicated control resource set may be a control resource set that is configured to be used exclusively for the terminal device 1. The dedicated control resource set may be provided based on at least dedicated RRC signaling and some or all of the value of the C-RNTI.

The control resource set may include a set of PDCCHs (or PDCCH candidates) monitored by the terminal device 1. The control resource set may be configured to include one or more search spaces (SS: Search Space).

A search area includes one or more PDCCH candidates at a certain aggregation level. The terminal device 1 receives the PDCCH candidates included in the search area and attempts to receive the PDCCH. Here, the PDCCH candidates are also called blind detection candidates.

The set of search areas includes one or more search areas. A set of search areas may be a common search space (CSS). The CSS may be provided based on at least some or all of the MIB, the first system information, the second system information, the common RRC signaling, and the cell ID. The CSS may be configured for monitoring the second DCI format. Monitoring of the first DCI format may not be configured in the CSS. The CSS may correspond to the second DCI format.

A set of search spaces may be a UE-specific Search Space (USS). The USS may be provided based at least on dedicated RRC signaling and some or all of the value of the C-RNTI. The USS may be configured for monitoring the first DCI format and/or the second DCI format. The USS may correspond to the first DCI format and/or the second DCI format.

The common control resource set may include at least one or both of the CSS and USS. The dedicated control resource set may include at least one or both of the CSS and USS.

The physical resources of the search area are composed of control channel components (CCE: Control Channel Element). A CCE is composed of a predetermined number of resource element groups (REG: Resource Element Group). For example, a CCE may be composed of six REGs. A REG may be composed of one OFDM symbol of one PRB (Physical Resource Block). In other words, a REG may be composed of 12 resource elements (RE: Resource Element). A PRB is also simply called an RB (Resource Block).

The PDSCH is used to transmit downlink data (DL-SCH, PDSCH). The PDSCH is used at least to transmit random access message 2 (random access response). The PDSCH is used at least to transmit system information including parameters used for initial access.

The PDSCH is provided based on at least some or all of the following: scrambling, modulation, layer mapping, precoding, and mapping to physical resource. The terminal device 1 may assume that the PDSCH is provided based on at least some or all of the following: scrambling, modulation, layer mapping, precoding, and mapping to physical resource.

In the scrambling, for a codeword q, a block of bits b ^(q) (i) may be scrambled based at least on a scrambling sequence c ^(q) (i) to generate b ^(q) _sc (i). In the block of bits b ^(q) (i), i may have a value ranging from 0 to M ^(q) _bit -1. M ^(q) _bit may be the number of bits of the codeword q transmitted on the PDSCH. The scrambling sequence c ^(q) (i) may be a sequence given based at least on a pseudorandom function (e.g., an M sequence, a Gold sequence, etc.). In the scrambling, for a codeword q, a block of bits b ^(q) (i) may be scrambled based on the scrambling sequence c ^(q) (i) and the following equation (1) to generate a block of scrambled bits b ^(q) _sc (i).

mod(A,B) may be a function that outputs the remainder when A is divided by B. mod(A,B) may be a function that outputs a value corresponding to the remainder when A is divided by B.

In the modulation, for a codeword q, a block of scrambling bits b ^(q) _sc (i) may be modulated based on a predetermined modulation scheme to generate a block of complex-valued modulation symbols d ^(q) (i). The predetermined modulation scheme may include at least some or all of QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM. Note that the predetermined modulation scheme may be provided based at least on DCI scheduling the PDSCH.

In layer mapping, a block of complex-valued modulation symbols d ^(q) (i) for each codeword may be mapped to one or more layers based on a predefined mapping procedure to generate a block of complex-valued modulation symbols x(i), which may be x(i) = [x ⁽⁰⁾ (i)...x ^(v-1) (i)], where v is the number of layers for the PDSCH.

In precoding, a block of complex-valued modulation symbols x(i) may be subjected to a predetermined precoding. In precoding, the block of complex-valued modulation symbols x(i) may be transformed into a block of complex-valued modulation symbols x(i) for v antenna ports. The number of antenna ports for the PDSCH and the number of layers for the PDSCH may be the same.

In the mapping to physical resources (physical resource mapping), the block x ^(p) (i) of complex-valued modulation symbols for antenna port p may be mapped from resource elements (k, l) of a resource block allocated for PDSCH with a priority on frequency, except for resource elements that satisfy at least a part or all of the following elements A to E. Here, mapping with a priority on frequency may mean mapping from k to k+M (M is a predetermined value) of symbol l of resource element (k, l), from k to k+M of symbol l+1, ..., from k to k+M of symbol l+N (N is a predetermined value). In the physical resource mapping, the block x ^(p) (i) of complex-valued modulation symbols for antenna port p may be mapped from resource elements (k, l) with a priority on time, except for resource elements that satisfy at least a part or all of the following elements A to E. Here, mapping with priority given to time may mean mapping symbols l to l+N (N is a predetermined value) of subcarrier index (resource element index) k of resource element (k, l), symbols l to l+N of subcarrier index k+1, ..., symbols l to l+N of subcarrier index k+M (M is a predetermined value), and so on.
Element A) A resource element element to which a DL DMRS related to a PDSCH is mapped. B) A resource element element to which a DL PTRS related to the DL DMRS is mapped. C) A resource element element to which a CSI-RS is configured and/or transmitted. D) A resource element element to which an SS block is configured and/or transmitted. E) A reserved resource.

The resource blocks allocated for the PDSCH (the resource blocks to which the PDSCH is mapped) are given based at least on the resource allocation information field included in the DCI format. Details of the resource blocks indicated by the resource allocation information field will be described later.

In Fig. 1, the following downlink physical signals are used in downlink wireless communication: The downlink physical signals may not be used to transmit information output from higher layers, but are used by the physical layer.
Synchronization signal (SS)
DL DMRS (Down Link DeModulation Reference Signal)
Shared RS (Shared Reference Signal)
・CSI-RS (Channel State Information-Reference Signal)
DL PTRS (DownLink Phase Tracking Reference Signal)
・TRS (Tracking Reference Signal)

The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and/or the time domain of the downlink. The synchronization signal includes a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

The SS block (SS/PBCH block) is configured to include at least a PSS, SSS, and some or all of the PBCH. The antenna ports of the PSS, SSS, and some or all of the PBCH included in the SS block may be the same. The PSS, SSS, and some or all of the PBCH included in the SS block may be mapped to consecutive OFDM symbols. The CP settings of the PSS, SSS, and some or all of the PBCH included in the SS block may be the same. The subcarrier spacing setting μ of the PSS, SSS, and some or all of the PBCH included in the SS block may be the same.

DL DMRS is related to the transmission of PBCH, PDCCH, and/or PDSCH. DL DMRS is multiplexed on PBCH, PDCCH, or PDSCH. The terminal device 1 may use the DL DMRS corresponding to the PBCH, the PDCCH, or the PDSCH to perform propagation path correction of the PBCH, the PDCCH, or the PDSCH. Hereinafter, the transmission of the PBCH and the DL DMRS associated with the PBCH together is simply referred to as the transmission of the PBCH. Hereinafter, the transmission of the PDCCH and the DL DMRS associated with the PDCCH together is simply referred to as the transmission of the PDCCH. Hereinafter, the transmission of the PDSCH and the DL DMRS associated with the PDSCH together is simply referred to as the transmission of the PDSCH. The DL DMRS associated with the PBCH is also referred to as the DL DMRS for the PBCH. The DL DMRS associated with the PDSCH is also referred to as DL DMRS for the PDSCH. The DL DMRS associated with the PDCCH is also referred to as DL DMRS associated with the PDCCH.

The Shared RS may be related to at least the transmission of the PDCCH. The Shared RS may be multiplexed into the PDCCH. The terminal device 1 may use the Shared RS to perform propagation path correction of the PDCCH. Hereinafter, the transmission of the PDCCH and the Shared RS related to the PDCCH together is also simply referred to as the transmission of the PDCCH.

The DL DMRS may be a reference signal that is individually set to the terminal device 1. The DL DMRS sequence may be given based at least on a parameter that is individually set to the terminal device 1. The DL DMRS sequence may be given based at least on a UE-specific value (e.g., C-RNTI, etc.). The DL DMRS may be transmitted individually for the PDCCH and/or the PDSCH. On the other hand, the Shared RS may be a reference signal that is commonly set to multiple terminal devices 1. The Shared RS sequence may be given regardless of the parameter that is individually set to the terminal device 1. For example, the Shared RS sequence may be given based on at least a part of the slot number, the minislot number, and the cell ID (identity). The Shared RS may be a reference signal that is transmitted regardless of whether the PDCCH and/or the PDSCH is transmitted.

The CSI-RS may be a signal that is at least used to calculate channel state information. The CSI-RS pattern assumed by the terminal device may be given by at least higher layer parameters.

The PTRS may be a signal used at least for phase noise compensation. The PTRS pattern assumed by the terminal device may be based at least on higher layer parameters and/or DCI.

The DL PTRS may be associated with a DL DMRS group that includes at least an antenna port used for one or more DL DMRSs. The association of the DL PTRS with the DL DMRS group may be such that the antenna port of the DL PTRS and some or all of the antenna ports included in the DL DMRS group are at least QCL. The DL DMRS group may be identified based at least on the antenna port with the smallest index in the DL DMRS included in the DL DMRS group.

The TRS may be a signal used at least for time and/or frequency synchronization. The TRS pattern assumed by the terminal device may be based at least on higher layer parameters and/or DCI.

The downlink physical channel and the downlink physical signal are also referred to as the downlink signal. The uplink physical channel and the uplink physical signal are also referred to as the uplink signal. The downlink signal and the uplink signal are also collectively referred to as the physical signal. The downlink signal and the uplink signal are also collectively referred to as the signal. The downlink physical channel and the uplink physical channel are collectively referred to as the physical channel. The downlink physical signal and the uplink physical signal are collectively referred to as the physical signal.

BCH, UL-SCH, and DL-SCH are transport channels. A channel used in the Medium Access Control (MAC) layer is called a transport channel. The unit of the transport channel used in the MAC layer is also called a transport block (TB) or MAC PDU. In the MAC layer, HARQ (Hybrid Automatic Repeat reQuest) control is performed for each transport block. A transport block is a unit of data that the MAC layer delivers to the physical layer. In the physical layer, the transport block is mapped to a codeword, and modulation processing is performed for each codeword.

The base station device 3 and the terminal device 1 exchange (transmit and receive) higher layer signals in the higher layer. For example, the base station device 3 and the terminal device 1 may transmit and receive RRC signaling (also called RRC message: Radio Resource Control message, RRC information: Radio Resource Control information) in the radio resource control (RRC) layer. In addition, the base station device 3 and the terminal device 1 may transmit and receive MAC CE (Control Element) in the MAC layer. Here, RRC signaling and/or MAC CE are also referred to as higher layer signaling.

The PUSCH and the PDSCH may be used at least to transmit RRC signaling and/or MAC CE. Here, the RRC signaling transmitted from the base station device 3 on the PDSCH may be common signaling for multiple terminal devices 1 in the serving cell. The signaling common to multiple terminal devices 1 in the serving cell is also referred to as common RRC signaling. The RRC signaling transmitted from the base station device 3 on the PDSCH may be dedicated signaling (also referred to as dedicated signaling or UE specific signaling) for a certain terminal device 1. The signaling dedicated to the terminal device 1 is also referred to as dedicated RRC signaling. The parameters of the upper layer specific to the serving cell may be transmitted using common signaling for multiple terminal devices 1 in the serving cell or dedicated signaling for a certain terminal device 1. UE-specific higher layer parameters may be transmitted using dedicated signaling to a certain terminal device 1. The PDSCH including the dedicated RRC signaling may be scheduled by the PDCCH in the first control resource set.

The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH is an upper layer channel used to transmit an MIB. The CCCH (Common Control CHannel) is an upper layer channel used to transmit information common to multiple terminal devices 1. Here, the CCCH may be used, for example, for a terminal device 1 that is not RRC-connected. The DCCH (Dedicated Control CHannel) is an upper layer channel that is used at least to transmit dedicated control information to the terminal device 1. Here, the DCCH may be used, for example, for a terminal device 1 that is RRC-connected.

The BCCH in the logical channel may be mapped to the BCH, DL-SCH, or UL-SCH in the transport channel. The CCCH in the logical channel may be mapped to the DL-SCH or UL-SCH in the transport channel. The DCCH in the logical channel may be mapped to the DL-SCH or UL-SCH in the transport channel.

The UL-SCH in the transport channel is mapped to the PUSCH in the physical channel. The DL-SCH in the transport channel is mapped to the PDSCH in the physical channel. The BCH in the transport channel is mapped to the PBCH in the physical channel.

Below, we will explain an example of a method for initial connection according to one aspect of this embodiment.

FIG. 6 is a diagram showing an example of mapping of SS blocks according to one aspect of the present embodiment. In FIG. 6, the horizontal axis indicates resource block indexes in the frequency domain. The resource block indexes in the frequency domain are also simply referred to as resource block indexes. As shown in FIG. 6, SS blocks in the frequency domain are mapped offset by the number of subcarriers N _offset from a reference point of the resource block index (e.g., resource block #0). N _offset may be set to 0. N _offset may be set to a value other than 0. N _offset is also referred to as subcarrier offset. N _offset may be given based on an information field of the MIB included in the PBCH included in the SS block. Also, a range of a predetermined number of resource blocks from a reference point of the resource block index may be set as a downlink initial active carrier band part in the frequency domain. In Fig. 6, the downlink initial active carrier band part in the frequency domain is set from resource block #0 to resource block #26.

The subcarrier _offset Noffset may be given based on at least a resource grid offset _{Noffset_RB_grid} and/or a resource block index offset _{Noffset_RB_index} . The resource grid _{offset Noffset_RB_grid} may indicate a value of a first subcarrier index in a first resource block to which an SS block is mapped in the frequency domain. The resource grid offset _{Noffset_RB_grid} may indicate a subcarrier-unit offset between the SS block and the resource grid. The resource block index offset _{Noffset_RB_index} may indicate an offset from a reference point of a resource block index for a first resource block to which an SS block is mapped in the frequency domain. The resource grid offset _{Noffset_RB_grid} may be given based on an information field of the MIB included in the PBCH included in the SS block. The resource block index offset N _{offset_RB_index} may be given based on an information field of the MIB included in the PBCH included in the SS block.

The downlink initial activation carrier band part may be given based at least on the bandwidth of the control resource set given based at least on the MIB. The bandwidth of the downlink initial activation carrier band part may be the same as the bandwidth of the control resource set given based at least on the MIB.

The terminal device 1 can specify a downlink initial activation carrier band part based at least on a subcarrier offset N _offset included in a PBCH included in an SS block and/or mapping of the SS block. The terminal device 1 can set the downlink initial activation carrier band part to a downlink active carrier band part and monitor a PDCCH in the downlink initial activation carrier band part. The PDCCH may be used at least for scheduling the first system information. The CRC sequence added to the PDCCH may be scrambled at least based on a System Information-Radio Network Temporary Identifier (SI-RNTI).

The terminal device 1 transmits the PRACH in the uplink active carrier band part. The first system information may include information indicating a physical resource for transmitting the PRACH in the uplink. The first system information may also include information indicating an uplink initial active carrier band part in the frequency domain. The downlink initial active carrier band part and the uplink initial active carrier band part are also referred to as the initial active carrier band part. When the PRACH is transmitted, the uplink initial active carrier band part may be set to the uplink active carrier band part.

The terminal device 1 can set the first downlink carrier bandwidth part as the downlink active carrier band part and monitor the PDCCH. The PDCCH may be a PDCCH that schedules a random access response (message 2 PDSCH). The CRC sequence added to the PDCCH may be scrambled by an RA-RNTI (Random Access - Radio Network Temporary Identifier). The RA-RNTI may be given based at least on the time index of the SS block. The random access response is transmitted including a random access response grant. The random access response grant is transmitted included in a random access response grant MAC CE. The message 2 PDSCH may include a random access response grant MAC CE.

The first downlink carrier band part may be given based at least on the first system information. If the first system information does not include information related to the first downlink carrier band part, the first downlink carrier band part may be a downlink initial activation carrier band part. If the first system information does not include information related to the first downlink carrier band part, the terminal device 1 may not change the setting of the downlink active carrier band part.

The terminal device 1 transmits a message 3 PUSCH based on at least the random access response grant.
The request may include a request.

The terminal device 1 can monitor the PDCCH in the first downlink carrier band part. The PDCCH may be used for scheduling the message 4 PDSCH. The message 4 PDSCH may include a contention resolution MAC CE.

Below, carrier band part adaptation in the terminal device 1 is explained. Carrier band adaptation includes an operation of changing the settings of the active carrier band part. Carrier band part adaptation may include at least changing the settings of the RF unit 32 and/or changing the settings of the baseband unit 33.

The terminal device 1 may set one downlink default carrier band part based at least on the dedicated RRC signaling. When the terminal device 1 does not receive the dedicated RRC signaling indicating the downlink default carrier band part, the downlink initial activation carrier band part may be set to the downlink default carrier band part. When the terminal device 1 does not receive the dedicated RRC signaling including at least the information indicating the downlink default carrier band part, and the first system information does not include the information indicating the first downlink carrier band part, the downlink initial activation carrier band part may be set to the downlink default carrier band part. When the terminal device 1 does not receive the dedicated RRC signaling including at least the information indicating the downlink default carrier band part, and the first system information includes the information indicating the first downlink carrier band part, the first downlink carrier band part may be set to the downlink default carrier band part.

The terminal device 1 may be configured with one or more downlink carrier band parts based at least on the dedicated RRC signaling. The terminal device 1 may also be configured with one or more downlink carrier band parts for one serving cell based at least on the dedicated RRC signaling.

Figure 7 is a diagram showing an example of carrier band part adaptation according to one aspect of the present embodiment. In the example shown in Figure 7, carrier band parts 511, 512, and 513 are set in a serving cell 500. Furthermore, carrier band part 511 is given by a frequency band between resource block index 501 and resource block index 502. Furthermore, carrier band part 512 is given by a frequency band between resource block index 503 and resource block index 504. Furthermore, carrier band part 513 is given by a frequency band between resource block index 505 and resource block index 506. Here, carrier band part 511 is set as the downlink default carrier band part.

In FIG. 7, the terminal device 1 receives a PDCCH 521 in a carrier band part 511 that is set to the downlink active carrier band part. Then, based on at least a CBP indication information field included in the DCI format included in the PDCCH 521, the terminal device 1 sets the carrier band part 512 to the downlink active carrier band part. Then, the terminal device 1 receives a PDSCH 522 in the carrier band part 512. Here, the DCI format included in the PDCCH 521 may be a first DCI format.

Between receiving PDCCH 521 and receiving PDSCH 522, terminal device 1 changes the downlink active carrier band part setting from carrier band part 511 to carrier band part 512.

When the terminal device 1 sets the carrier band part 512 as the downlink active carrier band part, the timer 531 starts. When the timer 531 expires without receiving a PDCCH that schedules the PDSCH in the carrier band part 512, the terminal device 1 may set the downlink default carrier band part as the downlink active carrier band part.

Next, the terminal device 1 receives PDCCH 523 and PDSCH 524 in the carrier band part 512. When a PDSCH (here, PDSCH 524) in the downlink active carrier band part is received, the timer 531 may be restarted.

Next, the terminal device 1 receives a PDCCH 525 in the carrier band part 512, and changes the setting of the downlink active carrier band part from the carrier band part 512 to the carrier band part 513 based at least on the CBP indication information field included in the DCI format included in the PDCCH 525. Next, the terminal device 1 receives a PDSCH 526 in the carrier band part 513. Here, the DCI format included in the PDCCH 525 may be a first DCI format.

When the terminal device 1 sets the carrier band part 513 to the downlink active carrier band part, the timer 532 starts. When the timer 532 expires without receiving a PDCCH that schedules the PDSCH in the carrier band part 513, the terminal device 1 may change the downlink default carrier band part to the downlink active carrier band part.

When the timer 532 expires, the terminal device 1 sets the downlink default carrier band part to the downlink active carrier band part. Next, the terminal device 1 receives the PDCCH 527 in the carrier band part 511 that is set to the downlink default carrier band part.

Timer 531 and timer 532 are timers that determine whether or not the terminal device 1 changes the setting of the downlink active carrier band part to the downlink default carrier band part. Hereinafter, timer 531 and timer 532 are also simply referred to as timers. Whether or not to set the downlink default carrier band part to the downlink active carrier band part may be determined based at least on the timer.

Figure 8 is a diagram showing an example of the operation of a timer according to one aspect of this embodiment. In Figure 8, the downlink default carrier band part may be carrier band part 511, and the downlink carrier band part other than the downlink carrier band part may be carrier band part 512 or 513. First, in step 1, when a carrier band part other than the downlink default carrier band part is set as a downlink active carrier band part, a timer for the carrier band part other than the downlink default carrier band part is started (step 2). Here, starting the timer may mean setting the value of the timer to an initial value. The initial value may be set for each carrier band part. In other words, the timer may be initialized by the initial value of the timer corresponding to the carrier band part set in the downlink active carrier band part. Starting the timer may mean starting a timer for a carrier band part and discarding a timer for a carrier band part before the setting of the downlink active carrier band part is changed to the carrier band part.

In step 3, if a PDCCH that schedules a PDSCH is received before the timer expires, proceed to step 4. In step 3, if a PDCCH that schedules a PDSCH is not received before the timer expires, proceed to step 5.

In step 4, if the PDSCH scheduled by the received PDCCH is a PDSCH in a downlink active carrier band part, the timer is restarted and the process proceeds to step 3. Restarting the timer may mean setting the value of the timer that has started for the downlink active carrier band part to an initial value.

In step 4, if the PDSCH scheduled by the received PDCCH is a PDSCH in a carrier band part other than the downlink active carrier band part, proceed to step 2. In step 4, a carrier band part other than the downlink default carrier band part to be set in the downlink active carrier band part may be indicated based at least on the CBP indication information field included in the DCI format included in the PDCCH.

In step 5, the downlink default carrier band part is set to the downlink active carrier band part and the process returns to step 1.

The downlink default carrier band part may be a carrier band part that is set to the downlink active carrier band part when the timer expires. When the downlink default carrier band part is set to the downlink active carrier band part, the timer may not be started. A timer and an initial value of the timer may not be set for the downlink default carrier band part. A timer and/or an initial value of the timer may be set (or may be related) for each carrier band part that is not the downlink default carrier band part and is set by dedicated RRC signaling. A carrier band part that is not the downlink default carrier band part and is set by dedicated RRC signaling is also referred to as a second downlink carrier band part. In other words, the second downlink carrier band part is a general term for carrier band parts other than the downlink initial activation carrier band part, the first carrier band part, and the downlink default carrier band part.

The second downlink carrier band part includes at least a carrier band part 512 in the serving cell 500 and a carrier band part 513 in the serving cell 500.

When a first downlink DCI format for the serving cell 500 is detected in the control resource set in the downlink default carrier band part in the serving cell 500, the carrier band part 512 in the serving cell 500 may be set to the downlink active carrier band part based at least on a CBP indication information field included in the first downlink DCI format. The carrier band part 512 may be a carrier band part indicated by the CBP indication information field. The resource allocation information field included in the first downlink DCI format may indicate to which set of resource blocks the PDSCH is mapped among the resource blocks included in the carrier band part 512 in the frequency domain. The size of the resource allocation information field included in the first downlink DCI format may be given based at least on the number of resource blocks included in the carrier band part 512 in the frequency domain. The size of the resource allocation information field may be set to the maximum value of the calculated values of the sizes of the resource allocation information fields for one or more downlink carrier band parts in the serving cell 500. The size of the resource allocation information field may be set based on the maximum number of RBGs included in one or more downlink carrier band parts in the serving cell in the frequency domain. That is, N _{RBG_CBP} for calculating the size of the resource allocation information field may be the maximum value of the number of RBGs included in one or more downlink carrier band parts configured in the serving cell 500 in the frequency domain. The size of the resource allocation information field may be set based on the maximum number of resource blocks included in one or more downlink carrier band parts configured in the serving cell 500 in the frequency domain. That is, N _{RB_CBP} for calculating the size of the resource allocation information field may be the maximum value of the number of resource blocks included in one or more downlink carrier band parts configured in the serving cell 500 in the frequency domain. An RBG size N _RBG may be set for each of one or more downlink carrier band parts. The size of the resource allocation information field included in the first downlink DCI format may be given based at least on dedicated RRC signaling.

The size of the resource allocation information field included in the first DCI format may be given for each serving cell.

In FDD mode, if a first uplink DCI format for the serving cell 500 is detected in the control resource set in the downlink default carrier band part in the serving cell 500, the downlink active carrier band part does not need to be changed.

In TDD mode, if a first uplink DCI format for the serving cell 500 is detected in the control resource set in the downlink default carrier band part in the serving cell 500, the downlink active carrier band part does not need to be changed.

When a second downlink DCI format for the serving cell 500 is detected in the control resource set in the downlink default carrier band part of the serving cell 500, the resource allocation information included in the second downlink DCI format may indicate to which set of resource blocks, among the resource blocks included in the downlink default carrier band part in the frequency domain, the PDSCH is mapped. The size of the resource allocation information field included in the second downlink DCI format may be given based at least on the number of resource blocks included in the downlink default carrier band part.

In FDD mode, if a second uplink DCI format for the serving cell 500 is detected in the control resource set in the downlink default carrier band part in the serving cell 500, the downlink active carrier band part does not need to be changed.

In TDD mode, if a second uplink DCI format for the serving cell 500 is detected in the control resource set in the downlink default carrier band part of the serving cell 500, the downlink active carrier band part does not need to be changed.

When a first downlink DCI format for the serving cell 500 is detected in the control resource set in the carrier band part 512 in the serving cell 500, the carrier band part 513 in the serving cell 500 may be set to the downlink active carrier band part based at least on a CBP indication information field included in the first downlink DCI format. The carrier band part 513 may be a carrier band part indicated by the CBP indication information field. The resource allocation information field included in the first downlink DCI format may indicate to which set of resource blocks the PDSCH is mapped among the resource blocks included in the carrier band part 513 in the frequency domain. The size of the resource allocation information field included in the first downlink DCI format may be given based at least on the number of resource blocks included in the carrier band part 513 in the frequency domain. The size of the resource allocation information field may be set to the maximum value of the calculated values of the sizes of the resource allocation information fields for one or more downlink carrier band parts in a serving cell. The size of the resource allocation information field may be set based on the maximum number of RBGs included in one or more downlink carrier band parts in the certain serving cell in the frequency domain. That is, N _{RBG_CBP} for calculating the size of the resource allocation information field may be the maximum value of the number of RBGs included in one or more downlink carrier band parts configured in the certain serving cell in the frequency domain. The size of the resource allocation information field may be set based on the maximum number of resource blocks included in one or more downlink carrier band parts configured in the certain serving cell in the frequency domain. That is, N _{RB_CBP} for calculating the size of the resource allocation information field may be the maximum value of the number of resource blocks included in one or more downlink carrier band parts configured in the certain serving cell in the frequency domain. An RBG size N _RBG may be set for each of the one or more downlink carrier band parts. The size of the resource allocation information field included in the first downlink DCI format may be given based at least on dedicated RRC signaling.

In FDD mode, if a first uplink DCI format for the serving cell 500 is detected in the control resource set in the carrier band part 512 in the serving cell 500, the downlink active carrier band part does not need to be changed.

In TDD mode, if a first uplink DCI format for the serving cell 500 is detected in the control resource set in the carrier band part 512 in the serving cell 500, the downlink active carrier band part does not need to be changed.

When a second downlink DCI format for the serving cell 500 is detected in the control resource set in the carrier band part 512 in the serving cell 500, the downlink default carrier band part may be set to the downlink active carrier band part. The resource allocation information field included in the second downlink DCI format may indicate to which set of resource blocks, among the resource blocks included in the downlink default carrier band part, the PDSCH is mapped. The size of the resource allocation information field included in the second downlink DCI format may be given based at least on the number of RBGs included in the downlink default carrier band part. The size of the resource allocation information field included in the second downlink DCI format may be given based at least on the number of resource blocks included in the downlink default carrier band part.

In FDD mode, if a second uplink DCI format for the serving cell 500 is detected in the control resource set in the carrier band part 512 in the serving cell 500, the downlink active carrier band part does not need to be changed.

In TDD mode, if a second uplink DCI format for the serving cell 500 is detected in the control resource set in the carrier band part 512 in the serving cell 500, the downlink active carrier band part does not need to be changed.

The number of resource blocks included in the downlink default carrier band part may be determined based at least on the subcarrier spacing between the PDCCH and the PDSCH in the downlink default carrier band part and the bandwidth of the downlink default carrier band part. The subcarrier spacing between the PDCCH and the PDSCH in the downlink default carrier band part may be determined based at least on the subcarrier spacing setting μ for the downlink default carrier band part. The bandwidth of the downlink default carrier band part may be determined based at least on the frequency/center frequency of the downlink default carrier band part, the band to which the downlink default carrier band part belongs, the common RRC signaling, and some or all of the dedicated RRC signaling.

The number of resource blocks included in the downlink default carrier band part may be the same as the subcarrier spacing between the PDCCH and PDSCH in the downlink initial activation carrier band part and the bandwidth of the downlink initial activation carrier band part. The subcarrier spacing between the PDCCH and PDSCH in the downlink default carrier band part may be the same as the subcarrier spacing setting μ for the downlink initial activation carrier band part. The bandwidth of the downlink default carrier band part may be given based on at least the frequency/center frequency of the downlink initial activation carrier band part, the band to which the downlink initial activation carrier band part belongs, the common RRC signaling, and some or all of the dedicated RRC signaling.

The resource allocation information field may identify resource blocks included in the carrier band part based at least on a resource offset value _{N_offset_CBP} associated with _{the carrier band part, which indicates that a point offset by the resource offset value N_offset_CBP from} a reference point of the resource block index for the carrier band part is set as a reference point of the resource block index for the carrier band part.

The reference point of the resource block index may be equal to the reference point of the resource block index for the downlink initially activated carrier band part. That is, the resource offset value N _{offset_CBP} associated with the downlink initially activated carrier band part may be 0. The resource offset value N _{offset_CBP} associated with the first downlink carrier band part may be provided based at least on the first system information. The resource offset value N _{offset_CBP} associated with the downlink default carrier band part may be provided based at least on the dedicated RRC signaling. The resource offset value N _{offset_CBP} associated with the second downlink carrier band part may be provided based at least on the dedicated RRC signaling.

FIG. 9 is a diagram showing an example of a resource block allocation method according to one aspect of the present embodiment. In FIG. 9, it is assumed that the resource block mapping pattern to which the PDSCH is mapped, indicated by the resource allocation information field, is given as shown in FIG. 9(a). It is also assumed that the resource offset value N _{offset_CBP} associated with carrier band part #0 (CBP#0) is 0. It is also assumed that the resource offset value N _{offset_CBP} associated with carrier band part #1 (CBP#1) is 10. It is also assumed that the resource offset value N _{offset_CBP} associated with carrier band part #2 (CBP#2) is 5. It is also assumed that the reference point of the resource block index is resource block #0.

In FIG. 9, the PDSCH is mapped to the resource blocks indicated by diagonal lines. Also, the resource blocks indicated by grid lines are reference points for the resource block indexes associated with each carrier band part. Since the resource offset value N _{offset_CBP} associated with carrier band part #0 is 0, it is mapped to PDSCH resource block indexes #2, #3, #6, #7, #8, and #9. Since the resource offset value N _{offset_CBP associated with carrier band part #1 is 10, it is mapped to PDSCH resource block indexes #12, #13, #16, #17, #18, and #19. Since the resource offset value N offset_CBP} associated with _carrier band part #2 is 5, it is mapped to PDSCH resource block indexes #7, #8, #11, #12, #13, and #14.

That is, the set of resource blocks to which the PDSCH is mapped, as indicated by the resource allocation information field, may be based at least on the value of the resource allocation information field and a resource offset value N _{offset_CBP} associated with the carrier band part, where the carrier band part may be the carrier band part to which the PDSCH is mapped. The set of resource blocks to which the PDSCH is mapped, as indicated by the resource allocation information field, may be based at least on the value of the resource allocation information field and a resource offset value N _{offset_CBP} associated with the carrier band part to which the PDSCH is mapped.

A resource offset value N _{offset_CBP_1} associated with a downlink carrier band part when a first DCI format for the serving cell 500 is detected may be different from a resource offset value N _{offset_CBP_2} associated with the downlink carrier band part when a second DCI format for the serving cell 500 is detected. The resource offset value N _{offset_CBP_1} and the resource offset value N _{offset_CBP_2} may each be provided based at least on dedicated RRC signaling.

Below, an example configuration of a terminal device 1 according to one aspect of this embodiment is described.

Figure 10 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this embodiment. As shown in the figure, the terminal device 1 includes a radio transmission/reception unit 10 and an upper layer processing unit 14. The radio transmission/reception unit 10 includes at least an antenna unit 11, an RF (Radio Frequency) unit 12, and a part or all of a baseband unit 13. The upper layer processing unit 14 includes at least a medium access control layer processing unit 15, and a part or all of a radio resource control layer processing unit 16. The radio transmission/reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

The upper layer processing unit 14 outputs uplink data (transport blocks) generated by user operations, etc., to the wireless transceiver unit 10. The upper layer processing unit 14 processes the MAC layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the RRC layer.

The media access control layer processing unit 15 provided in the upper layer processing unit 14 performs MAC layer processing.

The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs RRC layer processing. The radio resource control layer processing unit 16 manages various setting information/parameters of the own device. The radio resource control layer processing unit 16 sets various setting information/parameters based on upper layer signals received from the base station device 3. In other words, the radio resource control layer processing unit 16 sets various setting information/parameters based on information indicating various setting information/parameters received from the base station device 3. The parameters may be upper layer parameters.

The wireless transceiver unit 10 performs physical layer processing such as modulation, demodulation, encoding, and decoding. The wireless transceiver unit 10 separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper layer processing unit 14. The wireless transceiver unit 10 generates a physical signal by modulating, encoding, and generating a baseband signal (converting it into a time-continuous signal) on the data, and transmits it to the base station device 3.

The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by quadrature demodulation (down-convert) and removes unnecessary frequency components. The RF unit 12 outputs the processed analog signal to the baseband unit.

The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes the portion corresponding to the cyclic prefix (CP) from the converted digital signal, and performs a fast Fourier transform (FFT) on the signal from which the CP has been removed to extract the signal in the frequency domain.

The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the data to generate an OFDM symbol, adds a CP to the generated OFDM symbol, generates a baseband digital signal, and converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, up-converts the analog signal to a carrier frequency, and transmits it via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function of controlling the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

The following describes an example of the configuration of a base station device 3 according to one aspect of this embodiment.

Figure 11 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 includes a radio transmission/reception unit 30 and an upper layer processing unit 34. The radio transmission/reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transmission/reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

The upper layer processing unit 34 processes the MAC layer, PDCP layer, RLC layer, and RRC layer.

The media access control layer processing unit 35 provided in the upper layer processing unit 34 performs MAC layer processing.

The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs RRC layer processing. The radio resource control layer processing unit 36 generates downlink data (transport block), system information, RRC messages, MAC CE, etc. to be placed in the PDSCH, or acquires them from the upper node, and outputs them to the radio transceiver unit 30. The radio resource control layer processing unit 36 also manages various setting information/parameters for each terminal device 1. The radio resource control layer processing unit 36 may set various setting information/parameters for each terminal device 1 via a signal from the upper layer. That is, the radio resource control layer processing unit 36 transmits/reports information indicating various setting information/parameters.

The functions of the wireless transceiver unit 30 are similar to those of the wireless transceiver unit 10, so their explanation is omitted.

Each of the units numbered 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units numbered 30 to 36 in the base station device 3 may be configured as a circuit.

Various aspects of the device according to one aspect of this embodiment are described below.

(1) In order to achieve the above object, the aspects of the present invention take the following measures. That is, a first aspect of the present invention is a terminal device, comprising a receiver that receives a DCI format including at least a resource allocation information field and receives a PDSCH based on the resource allocation information field, the resource allocation information field indicating which set of resource blocks included in a carrier band part in the frequency domain the PDSCH is mapped to, and when the DCI format is a first DCI format including a CBP indication information field indicating a carrier band part to which the PDSCH is scheduled among a plurality of carrier band parts, the resource allocation information field indicates a set of resource blocks to which the PDSCH is mapped among the resource blocks included in the carrier band part indicated by the CBP indication information field in the frequency domain, and when the DCI format is a second DCI format not including the CBP indication information field, the resource allocation information field indicates a set of resource blocks to which the PDSCH is mapped among the resource blocks included in a default carrier band part.

(2) In addition, in the first aspect of the present invention, at least a portion of the fields included in the first DCI format are set based at least on the first dedicated RRC signaling, and the fields included in the second DCI format are set regardless of the first dedicated RRC signaling.

(3) Also, in the first aspect of the present invention, when a second dedicated RRC signaling including information regarding the setting of the default carrier band part is received, the default carrier band part is provided based on the second dedicated RRC signaling, and when the second dedicated RRC signaling is not received, an initial activation carrier band part is set to the default carrier band part, and the initial activation carrier band part is used at least for monitoring a PDCCH used for scheduling the first system information.

(4) Also, in the first aspect of the present invention, when the DCI format is the first DCI format, the size of the resource allocation information field corresponds to the maximum number of RBGs set for each of the multiple carrier band parts, and when the DCI format is the second DCI format, the size of the resource allocation information field corresponds to the number of RBGs set for the default carrier band part.

(5) A second aspect of the present invention is a base station device comprising a DCI format including at least a resource allocation information field and a transmission unit that transmits a PDSCH corresponding to the DCI format, the resource allocation information field indicating which set of resource blocks included in a carrier band part in the frequency domain the PDSCH is mapped to, and when the DCI format is a first DCI format including a CBP indication information field indicating a carrier band part to which the PDSCH is scheduled among a plurality of carrier band parts, the resource allocation information field indicates a set of resource blocks to which the PDSCH is mapped among the resource blocks included in the carrier band part indicated by the CBP indication information field in the frequency domain, and when the DCI format is a second DCI format that does not include the CBP indication information field, the resource allocation information field indicates a set of resource blocks to which the PDSCH is mapped among the resource blocks included in the default carrier band part.

(6) In addition, in a second aspect of the present invention, at least a portion of the fields included in the first DCI format are set based at least on the first dedicated RRC signaling, and the fields included in the second DCI format are set regardless of the first dedicated RRC signaling.

(7) Also, in the second aspect of the present invention, when the DCI format is the first DCI format, the size of the resource allocation information field corresponds to the maximum number of RBGs set for each of the multiple carrier band parts, and when the DCI format is the second DCI format, the size of the resource allocation information field corresponds to the number of RBGs set for the default carrier band part.

The programs that run on the base station device 3 and terminal device 1 related to the present invention may be programs that control a CPU (Central Processing Unit) or the like (programs that make a computer function) so as to realize the functions of the above-described embodiments related to the present invention. Information handled by these devices is temporarily stored in a RAM (Random Access Memory) during processing, and is then stored in various ROMs such as a Flash ROM (Read Only Memory) or an HDD (Hard Disk Drive), and is read, modified, and written by the CPU as necessary.

In addition, a part of the terminal device 1 and the base station device 3 in the above-mentioned embodiment may be realized by a computer. In that case, the program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed to realize the control function.

Note that the "computer system" referred to here is a computer system built into the terminal device 1 or base station device 3, and includes hardware such as the OS and peripheral devices. Additionally, the "computer-readable recording medium" refers to portable media such as floppy disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into the computer system.

Furthermore, "computer-readable recording medium" may also include something that dynamically holds a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or something that holds a program for a certain period of time, such as volatile memory inside a computer system that serves as a server or client in such a case. The above program may also be one that realizes part of the functions described above, or one that can realize the functions described above in combination with a program already recorded in the computer system.

The base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 related to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. The terminal device 1 related to the above-described embodiment can also communicate with the base station device as a collection.

In addition, the base station device 3 in the above-mentioned embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and/or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-mentioned embodiment may have some or all of the functions of an upper node for an eNodeB and/or a gNB.

In addition, some or all of the terminal device 1 and base station device 3 in the above-mentioned embodiments may be realized as an LSI, which is typically an integrated circuit, or as a chip set. Each functional block of the terminal device 1 and base station device 3 may be individually formed into a chip, or some or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI appears due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

In addition, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this, and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design modifications and the like that do not depart from the gist of the present invention are also included. Furthermore, the present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Also included are configurations in which elements described in the above embodiments are substituted for elements that have the same effect.

1 (1A, 1B, 1C) Terminal device 3 Base station device 10, 30 Radio transmission/reception unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Media access control layer processing unit 16, 36 Radio resource control layer processing unit 500 Serving cell 511, 512, 513 Carrier band part 501, 502, 503, 504, 505, 506 Resource block index 521, 523, 525, 527 PDCCH
522, 524, 526 PDSCH
531, 532 Timer

Claims (6)

A terminal device that communicates with a base station device in a serving cell,
An RRC layer processing unit and a receiving unit,
The RRC layer processing unit configures, in the serving cell, a downlink BWP (BandWidth Part) given by first system information, the downlink BWP being an active downlink BWP;
The RRC layer processing unit further configures a control resource set in the serving cell based on an MIB, and a time resource and/or a frequency resource of the control resource set is provided based on at least the MIB;
The receiver monitors a first PDCCH used for transmitting a first DCI format in the active downlink BWP, and monitors a second PDCCH used for transmitting a second DCI format in the active downlink BWP ;
a first number of bits of a first frequency resource allocation field for a first PDSCH included in the first DCI format is determined based on a number of resource blocks specifying a frequency band for the active downlink BWP;
a second number of bits of a second frequency resource allocation field for a second PDSCH included in the second DCI format is determined based on a number of resource blocks that specify a frequency band for the control resource set;
A third PDCCH used for scheduling the first system information is monitored in the control resource set.
Terminal device. A base station device that communicates with a terminal device in a serving cell,
An RRC layer processing unit and a transmission unit,
The RRC layer processing unit configures a downlink BWP (BandWidth Part) in the terminal device by using the first system information in the serving cell, the downlink BWP being an active downlink BWP;
The RRC layer processing unit further configures a control resource set in the serving cell using an MIB, and time resources and/or frequency resources of the control resource set are provided based on at least the MIB;
The transmitter transmits a first PDCCH used for transmitting a first DCI format in the active downlink BWP, and transmits a second PDCCH used for transmitting a second DCI format in the active downlink BWP ;
a first number of bits of a first frequency resource allocation field for a first PDSCH included in the first DCI format is determined based on a number of resource blocks specifying a frequency band for the active downlink BWP;
a second number of bits of a second frequency resource allocation field for a second PDSCH included in the second DCI format is determined based on a number of resource blocks that specify a frequency band for the control resource set;
a third PDCCH used for scheduling the first system information is transmitted in the control resource set;
Base station equipment. A communication method for a terminal device communicating with a base station device in a serving cell, comprising:
In the serving cell, a downlink BWP (BandWidth Part) is configured, the downlink BWP being an active downlink BWP, the downlink BWP being provided by first system information.
Configuring a control resource set in the serving cell, the control resource set being provided based on an MIB, the time resources and/or frequency resources of the control resource set being provided based on at least the MIB;
monitoring a first PDCCH used to transmit a first DCI format in the active downlink BWP , and monitoring a second PDCCH used to transmit a second DCI format in the active downlink BWP;
determining a first number of bits of a first frequency resource allocation field for a first PDSCH included in the first DCI format based on a number of resource blocks that identifies a frequency band for the active downlink BWP;
determining a second number of bits of a second frequency resource allocation field for a second PDSCH included in the second DCI format based on a number of resource blocks that identifies a frequency band for the control resource set;
monitoring a third PDCCH used for scheduling the first system information on the control resource set;
Communication method. A communication method for a base station device communicating with a terminal device in a serving cell, comprising:
In the serving cell, a downlink BWP (BandWidth Part) is configured in the terminal device using first system information, the downlink BWP being an active downlink BWP;
In the serving cell, a control resource set is configured in the terminal device using an MIB, and time resources and/or frequency resources of the control resource set are provided based on at least the MIB;
In the active downlink BWP, a first PDCCH used for transmitting a first DCI format is transmitted , and in the active downlink BWP, a second PDCCH used for transmitting a second DCI format is transmitted;
determining a first number of bits of a first frequency resource allocation field for a first PDSCH included in the first DCI format based on a number of resource blocks that identifies a frequency band for the active downlink BWP;
determining a second number of bits of a second frequency resource allocation field for a second PDSCH included in the second DCI format based on a number of resource blocks that identifies a frequency band for the control resource set;
transmitting a third PDCCH used for scheduling the first system information on the control resource set;
Communication method. a decoding unit that decodes the first PDSCH in the active downlink BWP based on the first DCI format included in the first PDCCH, and decodes the second PDSCH in the active downlink BWP based on the second DCI format included in the second PDCCH;
The terminal device according to claim 1 . decoding the first PDSCH in the active downlink BWP based on the first DCI format included in the first PDCCH, and decoding the second PDSCH in the active downlink BWP based on the second DCI format included in the second PDCCH;
The communication method according to claim 3.

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